HI, please try : Certain Firefox problems can be solved by performing a Clean reinstall. This means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.

To do a clean reinstall of Firefox, please follow these steps: Note: You might want to print these steps or view them in another browser.

1. Download the latest Desktop version of Firefox from this page) and save the setup file to your computer.
2. After the download finishes, close all Firefox windows (or open the Firefox menu and click the close button ).
3. Delete the Firefox installation folder, which is located in one of these locations, by default:
   • Windows:
     • C:\Program Files\Mozilla Firefox
     • C:\Program Files (x86)\Mozilla Firefox
   • Mac: Delete Firefox from the Applications folder.
   • Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
4. Now, go ahead and reinstall Firefox:
   1. Double-click the downloaded installation file and go through the steps of the installation wizard.
   2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

More information about reinstalling Firefox can be found here.

WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles.

Please report back to say if this helped you!

Thank you.

Thank you for your reply. Last time I used windows uninstall but this time I did as you suggested and deleted the Firefox folder. Your link gave me a bz2 file which I unpacked with 7Zip. When installed the folder contained no Firefox.exe so I tried again with the same result. I downloaded the Firefox Installer and used that. But the same thing happens click on a youtube link with "open in a new tab" and the tab flases open and then closes. Note clicking "open in a new tab " in my bookmarks works fine, as does clicking on a link just not opening a link in a new tab or new window.

You need to download the Firefox version for Windows. If you got a tar.bz2 archive then you likely clicked a link to get a version for Linux.

Current Firefox release:

• http://download.mozilla.org/?product=firefox-latest&os=win64&lang=en-US

Thank you, I used google to find the file I finally installed Firefox60.0.1.exe 37910 but I have now followed your link and done a clean install with Firefox 60.0.1.exe 38063 but there is no change to my problem.

Thanks for the help, Problem solved. Conflict between Ad Aware ad blocker and Firefox. Deleted Ad-Aware and all working as it should. I have been using Ad-Aware for months so why the problem now I have no idea.......